[parisc-linux] C110, kernel Panics, still more tears ;-(

[Bjorn Helgaas]

On Saturday 20 July 2002 9:29 am, Grant Grundler wrote:
> Juergen Braukmann wrote:
> > Hi Grant and all,
> >
> > still more tears. I compiled and replaced the kernel, using
> > 2.4.18pa55. I used the setting of ccio_mem_ratio=16, but still my
> > kernel panics with Kernel panic: ccio-dma.c ccio_alloc_range() I/O MMU
> > is out of mapping resources.
> > In interrupt handler - not syncing
>
> Sorry - my bad - I think I have it backwards.
> Using a smaller value will result in more IOMMU resource.

I have to ask the obvious question -- why not just always use
the largest possible IOVA space, as IA64 does?  Is it a question
of wasting space on IO PDIR entries?